36.  A man can row upstream 10 km/ph and downstream 20 km/ph. Find the man rate in still water and rate of the stream.


0,5
5,5
15,5
10,5


Answer

 Option

Rate in still water = 1/2(20+10) = 15 km/ph Rate of current = 1/2(20-10) = 5 km/ph

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37.  A man's speed with the current is 20 km/ph and speed of the current is 3 km/ph. The Man's speed against the current will be


11 km/ph
12 km/ph
14 km/ph
17 km/ph


Answer

 Option

Speed with current is 20, speed of the man + It is speed of the current Speed in still water = 20 - 3 = 17 Now speed against the current will be speed of the man - speed of the current = 17 - 3 = 14 km/ph

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38.  A boat can travel with a speed of 16 km/hr in still water. If the rate of stream is 5 km/hr, then find the time taken by the boat to cover distance of 84 km downstream.


4 hours
5 hours
6 hours
7 hours


Answer

 Option

Speed downstream = (16 + 5) = 21 km/ph Time = distance/speed = 84/21 = 4 hours

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39.  The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance traveled downstream in 12 minutes is


1.6 km
2 km
3.6 km
4 km


Answer

 Option

Speed down streams =(15 + 3)km/ph = 18 km/ph. Distance traveled = (18 x 12/60)km = 3.6km

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40.  Sahil can row 3 km against the stream in 20 minutes and he can return in 18 minutes. What is rate of current ?


1/2 km/hr
1/3 km/hr
2 km/hr
4 km/hr


Answer

 Option

Speed Upstream=3/20/60=9km/hr Speed Downstream=3/18/60=10km/hr Rate of current will be10−9/2=1/2km/hr

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